1 /* 2 * NCR 5380 generic driver routines. These should make it *trivial* 3 * to implement 5380 SCSI drivers under Linux with a non-trantor 4 * architecture. 5 * 6 * Note that these routines also work with NR53c400 family chips. 7 * 8 * Copyright 1993, Drew Eckhardt 9 * Visionary Computing 10 * (Unix and Linux consulting and custom programming) 11 * drew@colorado.edu 12 * +1 (303) 666-5836 13 * 14 * DISTRIBUTION RELEASE 6. 15 * 16 * For more information, please consult 17 * 18 * NCR 5380 Family 19 * SCSI Protocol Controller 20 * Databook 21 * 22 * NCR Microelectronics 23 * 1635 Aeroplaza Drive 24 * Colorado Springs, CO 80916 25 * 1+ (719) 578-3400 26 * 1+ (800) 334-5454 27 */ 28 29 /* 30 * $Log: NCR5380.c,v $ 31 32 * Revision 1.10 1998/9/2 Alan Cox 33 * (alan@redhat.com) 34 * Fixed up the timer lockups reported so far. Things still suck. Looking 35 * forward to 2.3 and per device request queues. Then it'll be possible to 36 * SMP thread this beast and improve life no end. 37 38 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg 39 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) 40 * (hopefully) fixed and enhanced USLEEP 41 * added support for DTC3181E card (for Mustek scanner) 42 * 43 44 * Revision 1.8 Ingmar Baumgart 45 * (ingmar@gonzo.schwaben.de) 46 * added support for NCR53C400a card 47 * 48 49 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) 50 * added proc_info 51 * added support needed for DTC 3180/3280 52 * fixed a couple of bugs 53 * 54 55 * Revision 1.5 1994/01/19 09:14:57 drew 56 * Fixed udelay() hack that was being used on DATAOUT phases 57 * instead of a proper wait for the final handshake. 58 * 59 * Revision 1.4 1994/01/19 06:44:25 drew 60 * *** empty log message *** 61 * 62 * Revision 1.3 1994/01/19 05:24:40 drew 63 * Added support for TCR LAST_BYTE_SENT bit. 64 * 65 * Revision 1.2 1994/01/15 06:14:11 drew 66 * REAL DMA support, bug fixes. 67 * 68 * Revision 1.1 1994/01/15 06:00:54 drew 69 * Initial revision 70 * 71 */ 72 73 /* 74 * Further development / testing that should be done : 75 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete 76 * code so that everything does the same thing that's done at the 77 * end of a pseudo-DMA read operation. 78 * 79 * 2. Fix REAL_DMA (interrupt driven, polled works fine) - 80 * basically, transfer size needs to be reduced by one 81 * and the last byte read as is done with PSEUDO_DMA. 82 * 83 * 4. Test SCSI-II tagged queueing (I have no devices which support 84 * tagged queueing) 85 * 86 * 5. Test linked command handling code after Eric is ready with 87 * the high level code. 88 */ 89 #include <scsi/scsi_dbg.h> 90 #include <scsi/scsi_transport_spi.h> 91 92 #ifndef NDEBUG 93 #define NDEBUG 0 94 #endif 95 #ifndef NDEBUG_ABORT 96 #define NDEBUG_ABORT 0 97 #endif 98 99 #if (NDEBUG & NDEBUG_LISTS) 100 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } 101 #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); } 102 #else 103 #define LIST(x,y) 104 #define REMOVE(w,x,y,z) 105 #endif 106 107 #ifndef notyet 108 #undef LINKED 109 #undef REAL_DMA 110 #endif 111 112 #ifdef REAL_DMA_POLL 113 #undef READ_OVERRUNS 114 #define READ_OVERRUNS 115 #endif 116 117 #ifdef BOARD_REQUIRES_NO_DELAY 118 #define io_recovery_delay(x) 119 #else 120 #define io_recovery_delay(x) udelay(x) 121 #endif 122 123 /* 124 * Design 125 * 126 * This is a generic 5380 driver. To use it on a different platform, 127 * one simply writes appropriate system specific macros (ie, data 128 * transfer - some PC's will use the I/O bus, 68K's must use 129 * memory mapped) and drops this file in their 'C' wrapper. 130 * 131 * (Note from hch: unfortunately it was not enough for the different 132 * m68k folks and instead of improving this driver they copied it 133 * and hacked it up for their needs. As a consequence they lost 134 * most updates to this driver. Maybe someone will fix all these 135 * drivers to use a common core one day..) 136 * 137 * As far as command queueing, two queues are maintained for 138 * each 5380 in the system - commands that haven't been issued yet, 139 * and commands that are currently executing. This means that an 140 * unlimited number of commands may be queued, letting 141 * more commands propagate from the higher driver levels giving higher 142 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, 143 * allowing multiple commands to propagate all the way to a SCSI-II device 144 * while a command is already executing. 145 * 146 * 147 * Issues specific to the NCR5380 : 148 * 149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 150 * piece of hardware that requires you to sit in a loop polling for 151 * the REQ signal as long as you are connected. Some devices are 152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 153 * while doing long seek operations. 154 * 155 * The workaround for this is to keep track of devices that have 156 * disconnected. If the device hasn't disconnected, for commands that 157 * should disconnect, we do something like 158 * 159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } 160 * 161 * Some tweaking of N and M needs to be done. An algorithm based 162 * on "time to data" would give the best results as long as short time 163 * to datas (ie, on the same track) were considered, however these 164 * broken devices are the exception rather than the rule and I'd rather 165 * spend my time optimizing for the normal case. 166 * 167 * Architecture : 168 * 169 * At the heart of the design is a coroutine, NCR5380_main, 170 * which is started from a workqueue for each NCR5380 host in the 171 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by 172 * removing the commands from the issue queue and calling 173 * NCR5380_select() if a nexus is not established. 174 * 175 * Once a nexus is established, the NCR5380_information_transfer() 176 * phase goes through the various phases as instructed by the target. 177 * if the target goes into MSG IN and sends a DISCONNECT message, 178 * the command structure is placed into the per instance disconnected 179 * queue, and NCR5380_main tries to find more work. If the target is 180 * idle for too long, the system will try to sleep. 181 * 182 * If a command has disconnected, eventually an interrupt will trigger, 183 * calling NCR5380_intr() which will in turn call NCR5380_reselect 184 * to reestablish a nexus. This will run main if necessary. 185 * 186 * On command termination, the done function will be called as 187 * appropriate. 188 * 189 * SCSI pointers are maintained in the SCp field of SCSI command 190 * structures, being initialized after the command is connected 191 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. 192 * Note that in violation of the standard, an implicit SAVE POINTERS operation 193 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. 194 */ 195 196 /* 197 * Using this file : 198 * This file a skeleton Linux SCSI driver for the NCR 5380 series 199 * of chips. To use it, you write an architecture specific functions 200 * and macros and include this file in your driver. 201 * 202 * These macros control options : 203 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be 204 * defined. 205 * 206 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 207 * for commands that return with a CHECK CONDITION status. 208 * 209 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential 210 * transceivers. 211 * 212 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or 213 * override-configure an IRQ. 214 * 215 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 216 * bytes at a time. Since interrupts are disabled by default during 217 * these transfers, we might need this to give reasonable interrupt 218 * service time if the transfer size gets too large. 219 * 220 * LINKED - if defined, linked commands are supported. 221 * 222 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. 223 * 224 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 225 * 226 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't 227 * rely on phase mismatch and EOP interrupts to determine end 228 * of phase. 229 * 230 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You 231 * only really want to use this if you're having a problem with 232 * dropped characters during high speed communications, and even 233 * then, you're going to be better off twiddling with transfersize 234 * in the high level code. 235 * 236 * Defaults for these will be provided although the user may want to adjust 237 * these to allocate CPU resources to the SCSI driver or "real" code. 238 * 239 * USLEEP_SLEEP - amount of time, in jiffies, to sleep 240 * 241 * USLEEP_POLL - amount of time, in jiffies, to poll 242 * 243 * These macros MUST be defined : 244 * NCR5380_local_declare() - declare any local variables needed for your 245 * transfer routines. 246 * 247 * NCR5380_setup(instance) - initialize any local variables needed from a given 248 * instance of the host adapter for NCR5380_{read,write,pread,pwrite} 249 * 250 * NCR5380_read(register) - read from the specified register 251 * 252 * NCR5380_write(register, value) - write to the specific register 253 * 254 * NCR5380_implementation_fields - additional fields needed for this 255 * specific implementation of the NCR5380 256 * 257 * Either real DMA *or* pseudo DMA may be implemented 258 * REAL functions : 259 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 260 * Note that the DMA setup functions should return the number of bytes 261 * that they were able to program the controller for. 262 * 263 * Also note that generic i386/PC versions of these macros are 264 * available as NCR5380_i386_dma_write_setup, 265 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 266 * 267 * NCR5380_dma_write_setup(instance, src, count) - initialize 268 * NCR5380_dma_read_setup(instance, dst, count) - initialize 269 * NCR5380_dma_residual(instance); - residual count 270 * 271 * PSEUDO functions : 272 * NCR5380_pwrite(instance, src, count) 273 * NCR5380_pread(instance, dst, count); 274 * 275 * The generic driver is initialized by calling NCR5380_init(instance), 276 * after setting the appropriate host specific fields and ID. If the 277 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 278 * possible) function may be used. 279 */ 280 281 static int do_abort(struct Scsi_Host *host); 282 static void do_reset(struct Scsi_Host *host); 283 284 /* 285 * initialize_SCp - init the scsi pointer field 286 * @cmd: command block to set up 287 * 288 * Set up the internal fields in the SCSI command. 289 */ 290 291 static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) 292 { 293 /* 294 * Initialize the Scsi Pointer field so that all of the commands in the 295 * various queues are valid. 296 */ 297 298 if (cmd->use_sg) { 299 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer; 300 cmd->SCp.buffers_residual = cmd->use_sg - 1; 301 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 302 cmd->SCp.buffer->offset; 303 cmd->SCp.this_residual = cmd->SCp.buffer->length; 304 } else { 305 cmd->SCp.buffer = NULL; 306 cmd->SCp.buffers_residual = 0; 307 cmd->SCp.ptr = (char *) cmd->request_buffer; 308 cmd->SCp.this_residual = cmd->request_bufflen; 309 } 310 } 311 312 /** 313 * NCR5380_poll_politely - wait for NCR5380 status bits 314 * @instance: controller to poll 315 * @reg: 5380 register to poll 316 * @bit: Bitmask to check 317 * @val: Value required to exit 318 * 319 * Polls the NCR5380 in a reasonably efficient manner waiting for 320 * an event to occur, after a short quick poll we begin giving the 321 * CPU back in non IRQ contexts 322 * 323 * Returns the value of the register or a negative error code. 324 */ 325 326 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) 327 { 328 NCR5380_local_declare(); 329 int n = 500; /* At about 8uS a cycle for the cpu access */ 330 unsigned long end = jiffies + t; 331 int r; 332 333 NCR5380_setup(instance); 334 335 while( n-- > 0) 336 { 337 r = NCR5380_read(reg); 338 if((r & bit) == val) 339 return 0; 340 cpu_relax(); 341 } 342 343 /* t time yet ? */ 344 while(time_before(jiffies, end)) 345 { 346 r = NCR5380_read(reg); 347 if((r & bit) == val) 348 return 0; 349 if(!in_interrupt()) 350 yield(); 351 else 352 cpu_relax(); 353 } 354 return -ETIMEDOUT; 355 } 356 357 static struct { 358 unsigned char value; 359 const char *name; 360 } phases[] = { 361 {PHASE_DATAOUT, "DATAOUT"}, 362 {PHASE_DATAIN, "DATAIN"}, 363 {PHASE_CMDOUT, "CMDOUT"}, 364 {PHASE_STATIN, "STATIN"}, 365 {PHASE_MSGOUT, "MSGOUT"}, 366 {PHASE_MSGIN, "MSGIN"}, 367 {PHASE_UNKNOWN, "UNKNOWN"} 368 }; 369 370 #if NDEBUG 371 static struct { 372 unsigned char mask; 373 const char *name; 374 } signals[] = { 375 {SR_DBP, "PARITY"}, 376 {SR_RST, "RST"}, 377 {SR_BSY, "BSY"}, 378 {SR_REQ, "REQ"}, 379 {SR_MSG, "MSG"}, 380 {SR_CD, "CD"}, 381 {SR_IO, "IO"}, 382 {SR_SEL, "SEL"}, 383 {0, NULL} 384 }, 385 basrs[] = { 386 {BASR_ATN, "ATN"}, 387 {BASR_ACK, "ACK"}, 388 {0, NULL} 389 }, 390 icrs[] = { 391 {ICR_ASSERT_RST, "ASSERT RST"}, 392 {ICR_ASSERT_ACK, "ASSERT ACK"}, 393 {ICR_ASSERT_BSY, "ASSERT BSY"}, 394 {ICR_ASSERT_SEL, "ASSERT SEL"}, 395 {ICR_ASSERT_ATN, "ASSERT ATN"}, 396 {ICR_ASSERT_DATA, "ASSERT DATA"}, 397 {0, NULL} 398 }, 399 mrs[] = { 400 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 401 {MR_TARGET, "MODE TARGET"}, 402 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 403 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 404 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 405 {MR_DMA_MODE, "MODE DMA"}, 406 {MR_ARBITRATE, "MODE ARBITRATION"}, 407 {0, NULL} 408 }; 409 410 /** 411 * NCR5380_print - print scsi bus signals 412 * @instance: adapter state to dump 413 * 414 * Print the SCSI bus signals for debugging purposes 415 * 416 * Locks: caller holds hostdata lock (not essential) 417 */ 418 419 static void NCR5380_print(struct Scsi_Host *instance) 420 { 421 NCR5380_local_declare(); 422 unsigned char status, data, basr, mr, icr, i; 423 NCR5380_setup(instance); 424 425 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 426 status = NCR5380_read(STATUS_REG); 427 mr = NCR5380_read(MODE_REG); 428 icr = NCR5380_read(INITIATOR_COMMAND_REG); 429 basr = NCR5380_read(BUS_AND_STATUS_REG); 430 431 printk("STATUS_REG: %02x ", status); 432 for (i = 0; signals[i].mask; ++i) 433 if (status & signals[i].mask) 434 printk(",%s", signals[i].name); 435 printk("\nBASR: %02x ", basr); 436 for (i = 0; basrs[i].mask; ++i) 437 if (basr & basrs[i].mask) 438 printk(",%s", basrs[i].name); 439 printk("\nICR: %02x ", icr); 440 for (i = 0; icrs[i].mask; ++i) 441 if (icr & icrs[i].mask) 442 printk(",%s", icrs[i].name); 443 printk("\nMODE: %02x ", mr); 444 for (i = 0; mrs[i].mask; ++i) 445 if (mr & mrs[i].mask) 446 printk(",%s", mrs[i].name); 447 printk("\n"); 448 } 449 450 451 /* 452 * NCR5380_print_phase - show SCSI phase 453 * @instance: adapter to dump 454 * 455 * Print the current SCSI phase for debugging purposes 456 * 457 * Locks: none 458 */ 459 460 static void NCR5380_print_phase(struct Scsi_Host *instance) 461 { 462 NCR5380_local_declare(); 463 unsigned char status; 464 int i; 465 NCR5380_setup(instance); 466 467 status = NCR5380_read(STATUS_REG); 468 if (!(status & SR_REQ)) 469 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); 470 else { 471 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); 472 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); 473 } 474 } 475 #endif 476 477 /* 478 * These need tweaking, and would probably work best as per-device 479 * flags initialized differently for disk, tape, cd, etc devices. 480 * People with broken devices are free to experiment as to what gives 481 * the best results for them. 482 * 483 * USLEEP_SLEEP should be a minimum seek time. 484 * 485 * USLEEP_POLL should be a maximum rotational latency. 486 */ 487 #ifndef USLEEP_SLEEP 488 /* 20 ms (reasonable hard disk speed) */ 489 #define USLEEP_SLEEP (20*HZ/1000) 490 #endif 491 /* 300 RPM (floppy speed) */ 492 #ifndef USLEEP_POLL 493 #define USLEEP_POLL (200*HZ/1000) 494 #endif 495 #ifndef USLEEP_WAITLONG 496 /* RvC: (reasonable time to wait on select error) */ 497 #define USLEEP_WAITLONG USLEEP_SLEEP 498 #endif 499 500 /* 501 * Function : int should_disconnect (unsigned char cmd) 502 * 503 * Purpose : decide whether a command would normally disconnect or 504 * not, since if it won't disconnect we should go to sleep. 505 * 506 * Input : cmd - opcode of SCSI command 507 * 508 * Returns : DISCONNECT_LONG if we should disconnect for a really long 509 * time (ie always, sleep, look for REQ active, sleep), 510 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal 511 * time-to-data delay, DISCONNECT_NONE if this command would return 512 * immediately. 513 * 514 * Future sleep algorithms based on time to data can exploit 515 * something like this so they can differentiate between "normal" 516 * (ie, read, write, seek) and unusual commands (ie, * format). 517 * 518 * Note : We don't deal with commands that handle an immediate disconnect, 519 * 520 */ 521 522 static int should_disconnect(unsigned char cmd) 523 { 524 switch (cmd) { 525 case READ_6: 526 case WRITE_6: 527 case SEEK_6: 528 case READ_10: 529 case WRITE_10: 530 case SEEK_10: 531 return DISCONNECT_TIME_TO_DATA; 532 case FORMAT_UNIT: 533 case SEARCH_HIGH: 534 case SEARCH_LOW: 535 case SEARCH_EQUAL: 536 return DISCONNECT_LONG; 537 default: 538 return DISCONNECT_NONE; 539 } 540 } 541 542 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) 543 { 544 hostdata->time_expires = jiffies + timeout; 545 schedule_delayed_work(&hostdata->coroutine, timeout); 546 } 547 548 549 static int probe_irq __initdata = 0; 550 551 /** 552 * probe_intr - helper for IRQ autoprobe 553 * @irq: interrupt number 554 * @dev_id: unused 555 * @regs: unused 556 * 557 * Set a flag to indicate the IRQ in question was received. This is 558 * used by the IRQ probe code. 559 */ 560 561 static irqreturn_t __init probe_intr(int irq, void *dev_id, 562 struct pt_regs *regs) 563 { 564 probe_irq = irq; 565 return IRQ_HANDLED; 566 } 567 568 /** 569 * NCR5380_probe_irq - find the IRQ of an NCR5380 570 * @instance: NCR5380 controller 571 * @possible: bitmask of ISA IRQ lines 572 * 573 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ 574 * and then looking to see what interrupt actually turned up. 575 * 576 * Locks: none, irqs must be enabled on entry 577 */ 578 579 static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible) 580 { 581 NCR5380_local_declare(); 582 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 583 unsigned long timeout; 584 int trying_irqs, i, mask; 585 NCR5380_setup(instance); 586 587 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) 588 if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0)) 589 trying_irqs |= mask; 590 591 timeout = jiffies + (250 * HZ / 1000); 592 probe_irq = SCSI_IRQ_NONE; 593 594 /* 595 * A interrupt is triggered whenever BSY = false, SEL = true 596 * and a bit set in the SELECT_ENABLE_REG is asserted on the 597 * SCSI bus. 598 * 599 * Note that the bus is only driven when the phase control signals 600 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that 601 * to zero. 602 */ 603 604 NCR5380_write(TARGET_COMMAND_REG, 0); 605 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 606 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 607 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); 608 609 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) 610 schedule_timeout_uninterruptible(1); 611 612 NCR5380_write(SELECT_ENABLE_REG, 0); 613 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 614 615 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) 616 if (trying_irqs & mask) 617 free_irq(i, NULL); 618 619 return probe_irq; 620 } 621 622 /** 623 * NCR58380_print_options - show options 624 * @instance: unused for now 625 * 626 * Called by probe code indicating the NCR5380 driver options that 627 * were selected. At some point this will switch to runtime options 628 * read from the adapter in question 629 * 630 * Locks: none 631 */ 632 633 static void __init NCR5380_print_options(struct Scsi_Host *instance) 634 { 635 printk(" generic options" 636 #ifdef AUTOPROBE_IRQ 637 " AUTOPROBE_IRQ" 638 #endif 639 #ifdef AUTOSENSE 640 " AUTOSENSE" 641 #endif 642 #ifdef DIFFERENTIAL 643 " DIFFERENTIAL" 644 #endif 645 #ifdef REAL_DMA 646 " REAL DMA" 647 #endif 648 #ifdef REAL_DMA_POLL 649 " REAL DMA POLL" 650 #endif 651 #ifdef PARITY 652 " PARITY" 653 #endif 654 #ifdef PSEUDO_DMA 655 " PSEUDO DMA" 656 #endif 657 #ifdef UNSAFE 658 " UNSAFE " 659 #endif 660 ); 661 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); 662 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 663 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { 664 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); 665 } 666 } 667 668 /** 669 * NCR5380_print_status - dump controller info 670 * @instance: controller to dump 671 * 672 * Print commands in the various queues, called from NCR5380_abort 673 * and NCR5380_debug to aid debugging. 674 * 675 * Locks: called functions disable irqs 676 */ 677 678 static void NCR5380_print_status(struct Scsi_Host *instance) 679 { 680 NCR5380_dprint(NDEBUG_ANY, instance); 681 NCR5380_dprint_phase(NDEBUG_ANY, instance); 682 } 683 684 /******************************************/ 685 /* 686 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 687 * 688 * *buffer: I/O buffer 689 * **start: if inout == FALSE pointer into buffer where user read should start 690 * offset: current offset 691 * length: length of buffer 692 * hostno: Scsi_Host host_no 693 * inout: TRUE - user is writing; FALSE - user is reading 694 * 695 * Return the number of bytes read from or written 696 */ 697 698 #undef SPRINTF 699 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) 700 static 701 char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); 702 static 703 char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); 704 static 705 char *lprint_opcode(int opcode, char *pos, char *buffer, int length); 706 707 static 708 int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout) 709 { 710 char *pos = buffer; 711 struct NCR5380_hostdata *hostdata; 712 Scsi_Cmnd *ptr; 713 714 hostdata = (struct NCR5380_hostdata *) instance->hostdata; 715 716 if (inout) { /* Has data been written to the file ? */ 717 #ifdef DTC_PUBLIC_RELEASE 718 dtc_wmaxi = dtc_maxi = 0; 719 #endif 720 #ifdef PAS16_PUBLIC_RELEASE 721 pas_wmaxi = pas_maxi = 0; 722 #endif 723 return (-ENOSYS); /* Currently this is a no-op */ 724 } 725 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); 726 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) 727 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); 728 #ifdef DTC_PUBLIC_RELEASE 729 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); 730 #endif 731 #ifdef T128_PUBLIC_RELEASE 732 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); 733 #endif 734 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE 735 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); 736 #endif 737 #ifdef PAS16_PUBLIC_RELEASE 738 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); 739 #endif 740 741 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); 742 SPRINTF("io_port: %04x ", (int) instance->io_port); 743 if (instance->irq == SCSI_IRQ_NONE) 744 SPRINTF("IRQ: None.\n"); 745 else 746 SPRINTF("IRQ: %d.\n", instance->irq); 747 748 #ifdef DTC_PUBLIC_RELEASE 749 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); 750 #endif 751 #ifdef PAS16_PUBLIC_RELEASE 752 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); 753 #endif 754 spin_lock_irq(instance->host_lock); 755 if (!hostdata->connected) 756 SPRINTF("scsi%d: no currently connected command\n", instance->host_no); 757 else 758 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); 759 SPRINTF("scsi%d: issue_queue\n", instance->host_no); 760 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 761 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 762 763 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); 764 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 765 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 766 spin_unlock_irq(instance->host_lock); 767 768 *start = buffer; 769 if (pos - buffer < offset) 770 return 0; 771 else if (pos - buffer - offset < length) 772 return pos - buffer - offset; 773 return length; 774 } 775 776 static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) 777 { 778 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); 779 SPRINTF(" command = "); 780 pos = lprint_command(cmd->cmnd, pos, buffer, length); 781 return (pos); 782 } 783 784 static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) 785 { 786 int i, s; 787 pos = lprint_opcode(command[0], pos, buffer, length); 788 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 789 SPRINTF("%02x ", command[i]); 790 SPRINTF("\n"); 791 return (pos); 792 } 793 794 static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) 795 { 796 SPRINTF("%2d (0x%02x)", opcode, opcode); 797 return (pos); 798 } 799 800 801 /** 802 * NCR5380_init - initialise an NCR5380 803 * @instance: adapter to configure 804 * @flags: control flags 805 * 806 * Initializes *instance and corresponding 5380 chip, 807 * with flags OR'd into the initial flags value. 808 * 809 * Notes : I assume that the host, hostno, and id bits have been 810 * set correctly. I don't care about the irq and other fields. 811 * 812 * Returns 0 for success 813 * 814 * Locks: interrupts must be enabled when we are called 815 */ 816 817 static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) 818 { 819 NCR5380_local_declare(); 820 int i, pass; 821 unsigned long timeout; 822 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 823 824 if(in_interrupt()) 825 printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); 826 /* 827 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 828 * the base address. 829 */ 830 831 #ifdef NCR53C400 832 if (flags & FLAG_NCR53C400) 833 instance->NCR5380_instance_name += NCR53C400_address_adjust; 834 #endif 835 836 NCR5380_setup(instance); 837 838 hostdata->aborted = 0; 839 hostdata->id_mask = 1 << instance->this_id; 840 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 841 if (i > hostdata->id_mask) 842 hostdata->id_higher_mask |= i; 843 for (i = 0; i < 8; ++i) 844 hostdata->busy[i] = 0; 845 #ifdef REAL_DMA 846 hostdata->dmalen = 0; 847 #endif 848 hostdata->targets_present = 0; 849 hostdata->connected = NULL; 850 hostdata->issue_queue = NULL; 851 hostdata->disconnected_queue = NULL; 852 853 INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata); 854 855 #ifdef NCR5380_STATS 856 for (i = 0; i < 8; ++i) { 857 hostdata->time_read[i] = 0; 858 hostdata->time_write[i] = 0; 859 hostdata->bytes_read[i] = 0; 860 hostdata->bytes_write[i] = 0; 861 } 862 hostdata->timebase = 0; 863 hostdata->pendingw = 0; 864 hostdata->pendingr = 0; 865 #endif 866 867 /* The CHECK code seems to break the 53C400. Will check it later maybe */ 868 if (flags & FLAG_NCR53C400) 869 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; 870 else 871 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; 872 873 hostdata->host = instance; 874 hostdata->time_expires = 0; 875 876 #ifndef AUTOSENSE 877 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) 878 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" 879 " be incorrectly cleared.\n", instance->host_no); 880 #endif /* def AUTOSENSE */ 881 882 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 883 NCR5380_write(MODE_REG, MR_BASE); 884 NCR5380_write(TARGET_COMMAND_REG, 0); 885 NCR5380_write(SELECT_ENABLE_REG, 0); 886 887 #ifdef NCR53C400 888 if (hostdata->flags & FLAG_NCR53C400) { 889 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); 890 } 891 #endif 892 893 /* 894 * Detect and correct bus wedge problems. 895 * 896 * If the system crashed, it may have crashed in a state 897 * where a SCSI command was still executing, and the 898 * SCSI bus is not in a BUS FREE STATE. 899 * 900 * If this is the case, we'll try to abort the currently 901 * established nexus which we know nothing about, and that 902 * failing, do a hard reset of the SCSI bus 903 */ 904 905 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 906 switch (pass) { 907 case 1: 908 case 3: 909 case 5: 910 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); 911 timeout = jiffies + 5 * HZ; 912 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); 913 break; 914 case 2: 915 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); 916 do_abort(instance); 917 break; 918 case 4: 919 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); 920 do_reset(instance); 921 break; 922 case 6: 923 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); 924 return -ENXIO; 925 } 926 } 927 return 0; 928 } 929 930 /** 931 * NCR5380_exit - remove an NCR5380 932 * @instance: adapter to remove 933 */ 934 935 static void __devexit NCR5380_exit(struct Scsi_Host *instance) 936 { 937 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 938 939 cancel_delayed_work(&hostdata->coroutine); 940 flush_scheduled_work(); 941 } 942 943 /** 944 * NCR5380_queue_command - queue a command 945 * @cmd: SCSI command 946 * @done: completion handler 947 * 948 * cmd is added to the per instance issue_queue, with minor 949 * twiddling done to the host specific fields of cmd. If the 950 * main coroutine is not running, it is restarted. 951 * 952 * Locks: host lock taken by caller 953 */ 954 955 static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 956 { 957 struct Scsi_Host *instance = cmd->device->host; 958 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 959 Scsi_Cmnd *tmp; 960 961 #if (NDEBUG & NDEBUG_NO_WRITE) 962 switch (cmd->cmnd[0]) { 963 case WRITE_6: 964 case WRITE_10: 965 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); 966 cmd->result = (DID_ERROR << 16); 967 done(cmd); 968 return 0; 969 } 970 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 971 972 #ifdef NCR5380_STATS 973 switch (cmd->cmnd[0]) { 974 case WRITE: 975 case WRITE_6: 976 case WRITE_10: 977 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 978 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; 979 hostdata->pendingw++; 980 break; 981 case READ: 982 case READ_6: 983 case READ_10: 984 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 985 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; 986 hostdata->pendingr++; 987 break; 988 } 989 #endif 990 991 /* 992 * We use the host_scribble field as a pointer to the next command 993 * in a queue 994 */ 995 996 cmd->host_scribble = NULL; 997 cmd->scsi_done = done; 998 cmd->result = 0; 999 1000 /* 1001 * Insert the cmd into the issue queue. Note that REQUEST SENSE 1002 * commands are added to the head of the queue since any command will 1003 * clear the contingent allegiance condition that exists and the 1004 * sense data is only guaranteed to be valid while the condition exists. 1005 */ 1006 1007 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 1008 LIST(cmd, hostdata->issue_queue); 1009 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; 1010 hostdata->issue_queue = cmd; 1011 } else { 1012 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); 1013 LIST(cmd, tmp); 1014 tmp->host_scribble = (unsigned char *) cmd; 1015 } 1016 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); 1017 1018 /* Run the coroutine if it isn't already running. */ 1019 /* Kick off command processing */ 1020 schedule_work(&hostdata->coroutine); 1021 return 0; 1022 } 1023 1024 1025 /** 1026 * NCR5380_main - NCR state machines 1027 * 1028 * NCR5380_main is a coroutine that runs as long as more work can 1029 * be done on the NCR5380 host adapters in a system. Both 1030 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1031 * in case it is not running. 1032 * 1033 * Locks: called as its own thread with no locks held. Takes the 1034 * host lock and called routines may take the isa dma lock. 1035 */ 1036 1037 static void NCR5380_main(void *p) 1038 { 1039 struct NCR5380_hostdata *hostdata = p; 1040 struct Scsi_Host *instance = hostdata->host; 1041 Scsi_Cmnd *tmp, *prev; 1042 int done; 1043 1044 spin_lock_irq(instance->host_lock); 1045 do { 1046 /* Lock held here */ 1047 done = 1; 1048 if (!hostdata->connected && !hostdata->selecting) { 1049 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); 1050 /* 1051 * Search through the issue_queue for a command destined 1052 * for a target that's not busy. 1053 */ 1054 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 1055 { 1056 if (prev != tmp) 1057 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); 1058 /* When we find one, remove it from the issue queue. */ 1059 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { 1060 if (prev) { 1061 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1062 prev->host_scribble = tmp->host_scribble; 1063 } else { 1064 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1065 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1066 } 1067 tmp->host_scribble = NULL; 1068 1069 /* 1070 * Attempt to establish an I_T_L nexus here. 1071 * On success, instance->hostdata->connected is set. 1072 * On failure, we must add the command back to the 1073 * issue queue so we can keep trying. 1074 */ 1075 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun)); 1076 1077 /* 1078 * A successful selection is defined as one that 1079 * leaves us with the command connected and 1080 * in hostdata->connected, OR has terminated the 1081 * command. 1082 * 1083 * With successful commands, we fall through 1084 * and see if we can do an information transfer, 1085 * with failures we will restart. 1086 */ 1087 hostdata->selecting = NULL; 1088 /* RvC: have to preset this to indicate a new command is being performed */ 1089 1090 if (!NCR5380_select(instance, tmp, 1091 /* 1092 * REQUEST SENSE commands are issued without tagged 1093 * queueing, even on SCSI-II devices because the 1094 * contingent allegiance condition exists for the 1095 * entire unit. 1096 */ 1097 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1098 break; 1099 } else { 1100 LIST(tmp, hostdata->issue_queue); 1101 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1102 hostdata->issue_queue = tmp; 1103 done = 0; 1104 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); 1105 } 1106 /* lock held here still */ 1107 } /* if target/lun is not busy */ 1108 } /* for */ 1109 /* exited locked */ 1110 } /* if (!hostdata->connected) */ 1111 if (hostdata->selecting) { 1112 tmp = (Scsi_Cmnd *) hostdata->selecting; 1113 /* Selection will drop and retake the lock */ 1114 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1115 /* Ok ?? */ 1116 } else { 1117 /* RvC: device failed, so we wait a long time 1118 this is needed for Mustek scanners, that 1119 do not respond to commands immediately 1120 after a scan */ 1121 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1122 LIST(tmp, hostdata->issue_queue); 1123 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1124 hostdata->issue_queue = tmp; 1125 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1126 } 1127 } /* if hostdata->selecting */ 1128 if (hostdata->connected 1129 #ifdef REAL_DMA 1130 && !hostdata->dmalen 1131 #endif 1132 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1133 ) { 1134 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); 1135 NCR5380_information_transfer(instance); 1136 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); 1137 done = 0; 1138 } else 1139 break; 1140 } while (!done); 1141 1142 spin_unlock_irq(instance->host_lock); 1143 } 1144 1145 #ifndef DONT_USE_INTR 1146 1147 /** 1148 * NCR5380_intr - generic NCR5380 irq handler 1149 * @irq: interrupt number 1150 * @dev_id: device info 1151 * @regs: registers (unused) 1152 * 1153 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1154 * from the disconnected queue, and restarting NCR5380_main() 1155 * as required. 1156 * 1157 * Locks: takes the needed instance locks 1158 */ 1159 1160 static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) 1161 { 1162 NCR5380_local_declare(); 1163 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id; 1164 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1165 int done; 1166 unsigned char basr; 1167 unsigned long flags; 1168 1169 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq)); 1170 1171 do { 1172 done = 1; 1173 spin_lock_irqsave(instance->host_lock, flags); 1174 /* Look for pending interrupts */ 1175 NCR5380_setup(instance); 1176 basr = NCR5380_read(BUS_AND_STATUS_REG); 1177 /* XXX dispatch to appropriate routine if found and done=0 */ 1178 if (basr & BASR_IRQ) { 1179 NCR5380_dprint(NDEBUG_INTR, instance); 1180 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1181 done = 0; 1182 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); 1183 NCR5380_reselect(instance); 1184 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1185 } else if (basr & BASR_PARITY_ERROR) { 1186 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); 1187 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1188 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1189 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); 1190 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1191 } else { 1192 #if defined(REAL_DMA) 1193 /* 1194 * We should only get PHASE MISMATCH and EOP interrupts 1195 * if we have DMA enabled, so do a sanity check based on 1196 * the current setting of the MODE register. 1197 */ 1198 1199 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { 1200 int transfered; 1201 1202 if (!hostdata->connected) 1203 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1204 1205 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance)); 1206 hostdata->connected->SCp.this_residual -= transferred; 1207 hostdata->connected->SCp.ptr += transferred; 1208 hostdata->dmalen = 0; 1209 1210 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1211 1212 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 1213 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); 1214 1215 NCR5380_write(MODE_REG, MR_BASE); 1216 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1217 } 1218 #else 1219 dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG))); 1220 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1221 #endif 1222 } 1223 } /* if BASR_IRQ */ 1224 spin_unlock_irqrestore(instance->host_lock, flags); 1225 if(!done) 1226 schedule_work(&hostdata->coroutine); 1227 } while (!done); 1228 return IRQ_HANDLED; 1229 } 1230 1231 #endif 1232 1233 /** 1234 * collect_stats - collect stats on a scsi command 1235 * @hostdata: adapter 1236 * @cmd: command being issued 1237 * 1238 * Update the statistical data by parsing the command in question 1239 */ 1240 1241 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 1242 { 1243 #ifdef NCR5380_STATS 1244 switch (cmd->cmnd[0]) { 1245 case WRITE: 1246 case WRITE_6: 1247 case WRITE_10: 1248 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1249 hostdata->pendingw--; 1250 break; 1251 case READ: 1252 case READ_6: 1253 case READ_10: 1254 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1255 hostdata->pendingr--; 1256 break; 1257 } 1258 #endif 1259 } 1260 1261 1262 /* 1263 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1264 * int tag); 1265 * 1266 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1267 * including ARBITRATION, SELECTION, and initial message out for 1268 * IDENTIFY and queue messages. 1269 * 1270 * Inputs : instance - instantiation of the 5380 driver on which this 1271 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1272 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1273 * the command that is presently connected. 1274 * 1275 * Returns : -1 if selection could not execute for some reason, 1276 * 0 if selection succeeded or failed because the target 1277 * did not respond. 1278 * 1279 * Side effects : 1280 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1281 * with registers as they should have been on entry - ie 1282 * SELECT_ENABLE will be set appropriately, the NCR5380 1283 * will cease to drive any SCSI bus signals. 1284 * 1285 * If successful : I_T_L or I_T_L_Q nexus will be established, 1286 * instance->connected will be set to cmd. 1287 * SELECT interrupt will be disabled. 1288 * 1289 * If failed (no target) : cmd->scsi_done() will be called, and the 1290 * cmd->result host byte set to DID_BAD_TARGET. 1291 * 1292 * Locks: caller holds hostdata lock in IRQ mode 1293 */ 1294 1295 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 1296 { 1297 NCR5380_local_declare(); 1298 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1299 unsigned char tmp[3], phase; 1300 unsigned char *data; 1301 int len; 1302 unsigned long timeout; 1303 unsigned char value; 1304 int err; 1305 NCR5380_setup(instance); 1306 1307 if (hostdata->selecting) 1308 goto part2; 1309 1310 hostdata->restart_select = 0; 1311 1312 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1313 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); 1314 1315 /* 1316 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1317 * data bus during SELECTION. 1318 */ 1319 1320 NCR5380_write(TARGET_COMMAND_REG, 0); 1321 1322 /* 1323 * Start arbitration. 1324 */ 1325 1326 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1327 NCR5380_write(MODE_REG, MR_ARBITRATE); 1328 1329 1330 /* We can be relaxed here, interrupts are on, we are 1331 in workqueue context, the birds are singing in the trees */ 1332 spin_unlock_irq(instance->host_lock); 1333 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); 1334 spin_lock_irq(instance->host_lock); 1335 if (err < 0) { 1336 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); 1337 NCR5380_write(MODE_REG, MR_BASE); 1338 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1339 goto failed; 1340 } 1341 1342 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); 1343 1344 /* 1345 * The arbitration delay is 2.2us, but this is a minimum and there is 1346 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1347 * the integral nature of udelay(). 1348 * 1349 */ 1350 1351 udelay(3); 1352 1353 /* Check for lost arbitration */ 1354 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1355 NCR5380_write(MODE_REG, MR_BASE); 1356 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); 1357 goto failed; 1358 } 1359 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); 1360 1361 if (!(hostdata->flags & FLAG_DTC3181E) && 1362 /* RvC: DTC3181E has some trouble with this 1363 * so we simply removed it. Seems to work with 1364 * only Mustek scanner attached 1365 */ 1366 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1367 NCR5380_write(MODE_REG, MR_BASE); 1368 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1369 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); 1370 goto failed; 1371 } 1372 /* 1373 * Again, bus clear + bus settle time is 1.2us, however, this is 1374 * a minimum so we'll udelay ceil(1.2) 1375 */ 1376 1377 udelay(2); 1378 1379 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); 1380 1381 /* 1382 * Now that we have won arbitration, start Selection process, asserting 1383 * the host and target ID's on the SCSI bus. 1384 */ 1385 1386 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); 1387 1388 /* 1389 * Raise ATN while SEL is true before BSY goes false from arbitration, 1390 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1391 * phase immediately after selection. 1392 */ 1393 1394 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1395 NCR5380_write(MODE_REG, MR_BASE); 1396 1397 /* 1398 * Reselect interrupts must be turned off prior to the dropping of BSY, 1399 * otherwise we will trigger an interrupt. 1400 */ 1401 NCR5380_write(SELECT_ENABLE_REG, 0); 1402 1403 /* 1404 * The initiator shall then wait at least two deskew delays and release 1405 * the BSY signal. 1406 */ 1407 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1408 1409 /* Reset BSY */ 1410 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1411 1412 /* 1413 * Something weird happens when we cease to drive BSY - looks 1414 * like the board/chip is letting us do another read before the 1415 * appropriate propagation delay has expired, and we're confusing 1416 * a BSY signal from ourselves as the target's response to SELECTION. 1417 * 1418 * A small delay (the 'C++' frontend breaks the pipeline with an 1419 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1420 * tighter 'C' code breaks and requires this) solves the problem - 1421 * the 1 us delay is arbitrary, and only used because this delay will 1422 * be the same on other platforms and since it works here, it should 1423 * work there. 1424 * 1425 * wingel suggests that this could be due to failing to wait 1426 * one deskew delay. 1427 */ 1428 1429 udelay(1); 1430 1431 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd))); 1432 1433 /* 1434 * The SCSI specification calls for a 250 ms timeout for the actual 1435 * selection. 1436 */ 1437 1438 timeout = jiffies + (250 * HZ / 1000); 1439 1440 /* 1441 * XXX very interesting - we're seeing a bounce where the BSY we 1442 * asserted is being reflected / still asserted (propagation delay?) 1443 * and it's detecting as true. Sigh. 1444 */ 1445 1446 hostdata->select_time = 0; /* we count the clock ticks at which we polled */ 1447 hostdata->selecting = cmd; 1448 1449 part2: 1450 /* RvC: here we enter after a sleeping period, or immediately after 1451 execution of part 1 1452 we poll only once ech clock tick */ 1453 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); 1454 1455 if (!value && (hostdata->select_time < HZ/4)) { 1456 /* RvC: we still must wait for a device response */ 1457 hostdata->select_time++; /* after 25 ticks the device has failed */ 1458 NCR5380_set_timer(hostdata, 1); 1459 return 0; /* RvC: we return here with hostdata->selecting set, 1460 to go to sleep */ 1461 } 1462 1463 hostdata->selecting = NULL;/* clear this pointer, because we passed the 1464 waiting period */ 1465 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1466 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1467 NCR5380_reselect(instance); 1468 printk("scsi%d : reselection after won arbitration?\n", instance->host_no); 1469 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1470 return -1; 1471 } 1472 /* 1473 * No less than two deskew delays after the initiator detects the 1474 * BSY signal is true, it shall release the SEL signal and may 1475 * change the DATA BUS. -wingel 1476 */ 1477 1478 udelay(1); 1479 1480 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1481 1482 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1483 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1484 if (hostdata->targets_present & (1 << scmd_id(cmd))) { 1485 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); 1486 if (hostdata->restart_select) 1487 printk(KERN_DEBUG "\trestart select\n"); 1488 NCR5380_dprint(NDEBUG_SELECTION, instance); 1489 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1490 return -1; 1491 } 1492 cmd->result = DID_BAD_TARGET << 16; 1493 collect_stats(hostdata, cmd); 1494 cmd->scsi_done(cmd); 1495 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1496 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); 1497 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1498 return 0; 1499 } 1500 hostdata->targets_present |= (1 << scmd_id(cmd)); 1501 1502 /* 1503 * Since we followed the SCSI spec, and raised ATN while SEL 1504 * was true but before BSY was false during selection, the information 1505 * transfer phase should be a MESSAGE OUT phase so that we can send the 1506 * IDENTIFY message. 1507 * 1508 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1509 * message (2 bytes) with a tag ID that we increment with every command 1510 * until it wraps back to 0. 1511 * 1512 * XXX - it turns out that there are some broken SCSI-II devices, 1513 * which claim to support tagged queuing but fail when more than 1514 * some number of commands are issued at once. 1515 */ 1516 1517 /* Wait for start of REQ/ACK handshake */ 1518 1519 spin_unlock_irq(instance->host_lock); 1520 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1521 spin_lock_irq(instance->host_lock); 1522 1523 if(err) { 1524 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); 1525 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1526 goto failed; 1527 } 1528 1529 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); 1530 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); 1531 1532 len = 1; 1533 cmd->tag = 0; 1534 1535 /* Send message(s) */ 1536 data = tmp; 1537 phase = PHASE_MSGOUT; 1538 NCR5380_transfer_pio(instance, &phase, &len, &data); 1539 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); 1540 /* XXX need to handle errors here */ 1541 hostdata->connected = cmd; 1542 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1543 1544 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) { 1545 initialize_SCp(cmd); 1546 } 1547 1548 return 0; 1549 1550 /* Selection failed */ 1551 failed: 1552 return -1; 1553 1554 } 1555 1556 /* 1557 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1558 * unsigned char *phase, int *count, unsigned char **data) 1559 * 1560 * Purpose : transfers data in given phase using polled I/O 1561 * 1562 * Inputs : instance - instance of driver, *phase - pointer to 1563 * what phase is expected, *count - pointer to number of 1564 * bytes to transfer, **data - pointer to data pointer. 1565 * 1566 * Returns : -1 when different phase is entered without transferring 1567 * maximum number of bytes, 0 if all bytes or transfered or exit 1568 * is in same phase. 1569 * 1570 * Also, *phase, *count, *data are modified in place. 1571 * 1572 * XXX Note : handling for bus free may be useful. 1573 */ 1574 1575 /* 1576 * Note : this code is not as quick as it could be, however it 1577 * IS 100% reliable, and for the actual data transfer where speed 1578 * counts, we will always do a pseudo DMA or DMA transfer. 1579 */ 1580 1581 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1582 NCR5380_local_declare(); 1583 unsigned char p = *phase, tmp; 1584 int c = *count; 1585 unsigned char *d = *data; 1586 /* 1587 * RvC: some administrative data to process polling time 1588 */ 1589 int break_allowed = 0; 1590 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1591 NCR5380_setup(instance); 1592 1593 if (!(p & SR_IO)) 1594 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); 1595 else 1596 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); 1597 1598 /* 1599 * The NCR5380 chip will only drive the SCSI bus when the 1600 * phase specified in the appropriate bits of the TARGET COMMAND 1601 * REGISTER match the STATUS REGISTER 1602 */ 1603 1604 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1605 1606 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1607 * so breaks are not necessary there 1608 */ 1609 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1610 break_allowed = 1; 1611 } 1612 do { 1613 /* 1614 * Wait for assertion of REQ, after which the phase bits will be 1615 * valid 1616 */ 1617 1618 /* RvC: we simply poll once, after that we stop temporarily 1619 * and let the device buffer fill up 1620 * if breaking is not allowed, we keep polling as long as needed 1621 */ 1622 1623 /* FIXME */ 1624 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1625 if (!(tmp & SR_REQ)) { 1626 /* timeout condition */ 1627 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1628 break; 1629 } 1630 1631 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); 1632 1633 /* Check for phase mismatch */ 1634 if ((tmp & PHASE_MASK) != p) { 1635 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); 1636 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1637 break; 1638 } 1639 /* Do actual transfer from SCSI bus to / from memory */ 1640 if (!(p & SR_IO)) 1641 NCR5380_write(OUTPUT_DATA_REG, *d); 1642 else 1643 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1644 1645 ++d; 1646 1647 /* 1648 * The SCSI standard suggests that in MSGOUT phase, the initiator 1649 * should drop ATN on the last byte of the message phase 1650 * after REQ has been asserted for the handshake but before 1651 * the initiator raises ACK. 1652 */ 1653 1654 if (!(p & SR_IO)) { 1655 if (!((p & SR_MSG) && c > 1)) { 1656 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1657 NCR5380_dprint(NDEBUG_PIO, instance); 1658 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1659 } else { 1660 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1661 NCR5380_dprint(NDEBUG_PIO, instance); 1662 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1663 } 1664 } else { 1665 NCR5380_dprint(NDEBUG_PIO, instance); 1666 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1667 } 1668 1669 /* FIXME - if this fails bus reset ?? */ 1670 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1671 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); 1672 1673 /* 1674 * We have several special cases to consider during REQ/ACK handshaking : 1675 * 1. We were in MSGOUT phase, and we are on the last byte of the 1676 * message. ATN must be dropped as ACK is dropped. 1677 * 1678 * 2. We are in a MSGIN phase, and we are on the last byte of the 1679 * message. We must exit with ACK asserted, so that the calling 1680 * code may raise ATN before dropping ACK to reject the message. 1681 * 1682 * 3. ACK and ATN are clear and the target may proceed as normal. 1683 */ 1684 if (!(p == PHASE_MSGIN && c == 1)) { 1685 if (p == PHASE_MSGOUT && c > 1) 1686 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1687 else 1688 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1689 } 1690 } while (--c); 1691 1692 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); 1693 1694 *count = c; 1695 *data = d; 1696 tmp = NCR5380_read(STATUS_REG); 1697 if (tmp & SR_REQ) 1698 *phase = tmp & PHASE_MASK; 1699 else 1700 *phase = PHASE_UNKNOWN; 1701 1702 if (!c || (*phase == p)) 1703 return 0; 1704 else 1705 return -1; 1706 } 1707 1708 /** 1709 * do_reset - issue a reset command 1710 * @host: adapter to reset 1711 * 1712 * Issue a reset sequence to the NCR5380 and try and get the bus 1713 * back into sane shape. 1714 * 1715 * Locks: caller holds queue lock 1716 */ 1717 1718 static void do_reset(struct Scsi_Host *host) { 1719 NCR5380_local_declare(); 1720 NCR5380_setup(host); 1721 1722 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1723 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1724 udelay(25); 1725 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1726 } 1727 1728 /* 1729 * Function : do_abort (Scsi_Host *host) 1730 * 1731 * Purpose : abort the currently established nexus. Should only be 1732 * called from a routine which can drop into a 1733 * 1734 * Returns : 0 on success, -1 on failure. 1735 * 1736 * Locks: queue lock held by caller 1737 * FIXME: sort this out and get new_eh running 1738 */ 1739 1740 static int do_abort(struct Scsi_Host *host) { 1741 NCR5380_local_declare(); 1742 unsigned char *msgptr, phase, tmp; 1743 int len; 1744 int rc; 1745 NCR5380_setup(host); 1746 1747 1748 /* Request message out phase */ 1749 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1750 1751 /* 1752 * Wait for the target to indicate a valid phase by asserting 1753 * REQ. Once this happens, we'll have either a MSGOUT phase 1754 * and can immediately send the ABORT message, or we'll have some 1755 * other phase and will have to source/sink data. 1756 * 1757 * We really don't care what value was on the bus or what value 1758 * the target sees, so we just handshake. 1759 */ 1760 1761 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1762 1763 if(rc < 0) 1764 return -1; 1765 1766 tmp = (unsigned char)rc; 1767 1768 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1769 1770 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1771 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1772 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1773 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1774 if(rc == -1) 1775 return -1; 1776 } 1777 tmp = ABORT; 1778 msgptr = &tmp; 1779 len = 1; 1780 phase = PHASE_MSGOUT; 1781 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1782 1783 /* 1784 * If we got here, and the command completed successfully, 1785 * we're about to go into bus free state. 1786 */ 1787 1788 return len ? -1 : 0; 1789 } 1790 1791 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1792 /* 1793 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1794 * unsigned char *phase, int *count, unsigned char **data) 1795 * 1796 * Purpose : transfers data in given phase using either real 1797 * or pseudo DMA. 1798 * 1799 * Inputs : instance - instance of driver, *phase - pointer to 1800 * what phase is expected, *count - pointer to number of 1801 * bytes to transfer, **data - pointer to data pointer. 1802 * 1803 * Returns : -1 when different phase is entered without transferring 1804 * maximum number of bytes, 0 if all bytes or transfered or exit 1805 * is in same phase. 1806 * 1807 * Also, *phase, *count, *data are modified in place. 1808 * 1809 * Locks: io_request lock held by caller 1810 */ 1811 1812 1813 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1814 NCR5380_local_declare(); 1815 register int c = *count; 1816 register unsigned char p = *phase; 1817 register unsigned char *d = *data; 1818 unsigned char tmp; 1819 int foo; 1820 #if defined(REAL_DMA_POLL) 1821 int cnt, toPIO; 1822 unsigned char saved_data = 0, overrun = 0, residue; 1823 #endif 1824 1825 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1826 1827 NCR5380_setup(instance); 1828 1829 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1830 *phase = tmp; 1831 return -1; 1832 } 1833 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1834 #ifdef READ_OVERRUNS 1835 if (p & SR_IO) { 1836 c -= 2; 1837 } 1838 #endif 1839 dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d)); 1840 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1841 #endif 1842 1843 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1844 1845 #ifdef REAL_DMA 1846 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1847 #elif defined(REAL_DMA_POLL) 1848 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1849 #else 1850 /* 1851 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1852 * were not disabled for the duration of a single DMA transfer, from 1853 * before the setting of DMA mode to after transfer of the last byte. 1854 */ 1855 1856 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1857 spin_unlock_irq(instance->host_lock); 1858 #endif 1859 /* KLL May need eop and parity in 53c400 */ 1860 if (hostdata->flags & FLAG_NCR53C400) 1861 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY); 1862 else 1863 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1864 #endif /* def REAL_DMA */ 1865 1866 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); 1867 1868 /* 1869 * On the PAS16 at least I/O recovery delays are not needed here. 1870 * Everyone else seems to want them. 1871 */ 1872 1873 if (p & SR_IO) { 1874 io_recovery_delay(1); 1875 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1876 } else { 1877 io_recovery_delay(1); 1878 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1879 io_recovery_delay(1); 1880 NCR5380_write(START_DMA_SEND_REG, 0); 1881 io_recovery_delay(1); 1882 } 1883 1884 #if defined(REAL_DMA_POLL) 1885 do { 1886 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1887 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1888 1889 /* 1890 At this point, either we've completed DMA, or we have a phase mismatch, 1891 or we've unexpectedly lost BUSY (which is a real error). 1892 1893 For write DMAs, we want to wait until the last byte has been 1894 transferred out over the bus before we turn off DMA mode. Alas, there 1895 seems to be no terribly good way of doing this on a 5380 under all 1896 conditions. For non-scatter-gather operations, we can wait until REQ 1897 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1898 are nastier, since the device will be expecting more data than we 1899 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1900 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1901 why this signal was added to the newer chips) but on the older 538[01] 1902 this signal does not exist. The workaround for this lack is a watchdog; 1903 we bail out of the wait-loop after a modest amount of wait-time if 1904 the usual exit conditions are not met. Not a terribly clean or 1905 correct solution :-% 1906 1907 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1908 If the chip is in DMA mode for an READ, it will respond to a target's 1909 REQ by latching the SCSI data into the INPUT DATA register and asserting 1910 ACK, even if it has _already_ been notified by the DMA controller that 1911 the current DMA transfer has completed! If the NCR5380 is then taken 1912 out of DMA mode, this already-acknowledged byte is lost. 1913 1914 This is not a problem for "one DMA transfer per command" reads, because 1915 the situation will never arise... either all of the data is DMA'ed 1916 properly, or the target switches to MESSAGE IN phase to signal a 1917 disconnection (either operation bringing the DMA to a clean halt). 1918 However, in order to handle scatter-reads, we must work around the 1919 problem. The chosen fix is to DMA N-2 bytes, then check for the 1920 condition before taking the NCR5380 out of DMA mode. One or two extra 1921 bytes are transferred via PIO as necessary to fill out the original 1922 request. 1923 */ 1924 1925 if (p & SR_IO) { 1926 #ifdef READ_OVERRUNS 1927 udelay(10); 1928 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1929 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1930 overrun = 1; 1931 } 1932 #endif 1933 } else { 1934 int limit = 100; 1935 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1936 if (!(tmp & BASR_PHASE_MATCH)) 1937 break; 1938 if (--limit < 0) 1939 break; 1940 } 1941 } 1942 1943 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); 1944 1945 NCR5380_write(MODE_REG, MR_BASE); 1946 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1947 1948 residue = NCR5380_dma_residual(instance); 1949 c -= residue; 1950 *count -= c; 1951 *data += c; 1952 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1953 1954 #ifdef READ_OVERRUNS 1955 if (*phase == p && (p & SR_IO) && residue == 0) { 1956 if (overrun) { 1957 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); 1958 **data = saved_data; 1959 *data += 1; 1960 *count -= 1; 1961 cnt = toPIO = 1; 1962 } else { 1963 printk("No overrun??\n"); 1964 cnt = toPIO = 2; 1965 } 1966 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); 1967 NCR5380_transfer_pio(instance, phase, &cnt, data); 1968 *count -= toPIO - cnt; 1969 } 1970 #endif 1971 1972 dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count))); 1973 return 0; 1974 1975 #elif defined(REAL_DMA) 1976 return 0; 1977 #else /* defined(REAL_DMA_POLL) */ 1978 if (p & SR_IO) { 1979 #ifdef DMA_WORKS_RIGHT 1980 foo = NCR5380_pread(instance, d, c); 1981 #else 1982 int diff = 1; 1983 if (hostdata->flags & FLAG_NCR53C400) { 1984 diff = 0; 1985 } 1986 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1987 /* 1988 * We can't disable DMA mode after successfully transferring 1989 * what we plan to be the last byte, since that would open up 1990 * a race condition where if the target asserted REQ before 1991 * we got the DMA mode reset, the NCR5380 would have latched 1992 * an additional byte into the INPUT DATA register and we'd 1993 * have dropped it. 1994 * 1995 * The workaround was to transfer one fewer bytes than we 1996 * intended to with the pseudo-DMA read function, wait for 1997 * the chip to latch the last byte, read it, and then disable 1998 * pseudo-DMA mode. 1999 * 2000 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 2001 * REQ is deasserted when ACK is asserted, and not reasserted 2002 * until ACK goes false. Since the NCR5380 won't lower ACK 2003 * until DACK is asserted, which won't happen unless we twiddle 2004 * the DMA port or we take the NCR5380 out of DMA mode, we 2005 * can guarantee that we won't handshake another extra 2006 * byte. 2007 */ 2008 2009 if (!(hostdata->flags & FLAG_NCR53C400)) { 2010 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 2011 /* Wait for clean handshake */ 2012 while (NCR5380_read(STATUS_REG) & SR_REQ); 2013 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2014 } 2015 } 2016 #endif 2017 } else { 2018 #ifdef DMA_WORKS_RIGHT 2019 foo = NCR5380_pwrite(instance, d, c); 2020 #else 2021 int timeout; 2022 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); 2023 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2024 /* 2025 * Wait for the last byte to be sent. If REQ is being asserted for 2026 * the byte we're interested, we'll ACK it and it will go false. 2027 */ 2028 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2029 timeout = 20000; 2030 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2031 2032 if (!timeout) 2033 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); 2034 2035 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2036 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2037 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2038 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2039 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); 2040 } 2041 } 2042 } else { 2043 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); 2044 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2045 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); 2046 } 2047 } 2048 #endif 2049 } 2050 NCR5380_write(MODE_REG, MR_BASE); 2051 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2052 2053 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2054 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); 2055 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2056 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); 2057 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2058 } else { 2059 printk("53C400w: IRQ NOT THERE!\n"); 2060 } 2061 } 2062 *data = d + c; 2063 *count = 0; 2064 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2065 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2066 spin_lock_irq(instance->host_lock); 2067 #endif /* defined(REAL_DMA_POLL) */ 2068 return foo; 2069 #endif /* def REAL_DMA */ 2070 } 2071 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2072 2073 /* 2074 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2075 * 2076 * Purpose : run through the various SCSI phases and do as the target 2077 * directs us to. Operates on the currently connected command, 2078 * instance->connected. 2079 * 2080 * Inputs : instance, instance for which we are doing commands 2081 * 2082 * Side effects : SCSI things happen, the disconnected queue will be 2083 * modified if a command disconnects, *instance->connected will 2084 * change. 2085 * 2086 * XXX Note : we need to watch for bus free or a reset condition here 2087 * to recover from an unexpected bus free condition. 2088 * 2089 * Locks: io_request_lock held by caller in IRQ mode 2090 */ 2091 2092 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2093 NCR5380_local_declare(); 2094 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2095 unsigned char msgout = NOP; 2096 int sink = 0; 2097 int len; 2098 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2099 int transfersize; 2100 #endif 2101 unsigned char *data; 2102 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2103 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2104 /* RvC: we need to set the end of the polling time */ 2105 unsigned long poll_time = jiffies + USLEEP_POLL; 2106 2107 NCR5380_setup(instance); 2108 2109 while (1) { 2110 tmp = NCR5380_read(STATUS_REG); 2111 /* We only have a valid SCSI phase when REQ is asserted */ 2112 if (tmp & SR_REQ) { 2113 phase = (tmp & PHASE_MASK); 2114 if (phase != old_phase) { 2115 old_phase = phase; 2116 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2117 } 2118 if (sink && (phase != PHASE_MSGOUT)) { 2119 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2120 2121 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2122 while (NCR5380_read(STATUS_REG) & SR_REQ); 2123 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2124 sink = 0; 2125 continue; 2126 } 2127 switch (phase) { 2128 case PHASE_DATAIN: 2129 case PHASE_DATAOUT: 2130 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2131 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2132 sink = 1; 2133 do_abort(instance); 2134 cmd->result = DID_ERROR << 16; 2135 cmd->done(cmd); 2136 return; 2137 #endif 2138 /* 2139 * If there is no room left in the current buffer in the 2140 * scatter-gather list, move onto the next one. 2141 */ 2142 2143 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2144 ++cmd->SCp.buffer; 2145 --cmd->SCp.buffers_residual; 2146 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2147 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 2148 cmd->SCp.buffer->offset; 2149 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); 2150 } 2151 /* 2152 * The preferred transfer method is going to be 2153 * PSEUDO-DMA for systems that are strictly PIO, 2154 * since we can let the hardware do the handshaking. 2155 * 2156 * For this to work, we need to know the transfersize 2157 * ahead of time, since the pseudo-DMA code will sit 2158 * in an unconditional loop. 2159 */ 2160 2161 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2162 /* KLL 2163 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2164 * driver then it will always be defined, so the 2165 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2166 * NCR5380 case. I think this is a fairly clean solution. 2167 * We supplement these 2 if's with the flag. 2168 */ 2169 #ifdef NCR5380_dma_xfer_len 2170 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2171 #else 2172 transfersize = cmd->transfersize; 2173 2174 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2175 if (transfersize > 512) 2176 transfersize = 512; 2177 #endif /* LIMIT_TRANSFERSIZE */ 2178 2179 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2180 /* Limit transfers to 32K, for xx400 & xx406 2181 * pseudoDMA that transfers in 128 bytes blocks. */ 2182 if (transfersize > 32 * 1024) 2183 transfersize = 32 * 1024; 2184 #endif 2185 len = transfersize; 2186 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2187 /* 2188 * If the watchdog timer fires, all future accesses to this 2189 * device will use the polled-IO. 2190 */ 2191 scmd_printk(KERN_INFO, cmd, 2192 "switching to slow handshake\n"); 2193 cmd->device->borken = 1; 2194 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2195 sink = 1; 2196 do_abort(instance); 2197 cmd->result = DID_ERROR << 16; 2198 cmd->done(cmd); 2199 /* XXX - need to source or sink data here, as appropriate */ 2200 } else 2201 cmd->SCp.this_residual -= transfersize - len; 2202 } else 2203 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2204 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2205 &cmd->SCp.ptr); 2206 break; 2207 case PHASE_MSGIN: 2208 len = 1; 2209 data = &tmp; 2210 NCR5380_transfer_pio(instance, &phase, &len, &data); 2211 cmd->SCp.Message = tmp; 2212 2213 switch (tmp) { 2214 /* 2215 * Linking lets us reduce the time required to get the 2216 * next command out to the device, hopefully this will 2217 * mean we don't waste another revolution due to the delays 2218 * required by ARBITRATION and another SELECTION. 2219 * 2220 * In the current implementation proposal, low level drivers 2221 * merely have to start the next command, pointed to by 2222 * next_link, done() is called as with unlinked commands. 2223 */ 2224 #ifdef LINKED 2225 case LINKED_CMD_COMPLETE: 2226 case LINKED_FLG_CMD_COMPLETE: 2227 /* Accept message by clearing ACK */ 2228 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2229 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2230 /* 2231 * Sanity check : A linked command should only terminate with 2232 * one of these messages if there are more linked commands 2233 * available. 2234 */ 2235 if (!cmd->next_link) { 2236 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2237 sink = 1; 2238 do_abort(instance); 2239 return; 2240 } 2241 initialize_SCp(cmd->next_link); 2242 /* The next command is still part of this process */ 2243 cmd->next_link->tag = cmd->tag; 2244 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2245 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2246 collect_stats(hostdata, cmd); 2247 cmd->scsi_done(cmd); 2248 cmd = hostdata->connected; 2249 break; 2250 #endif /* def LINKED */ 2251 case ABORT: 2252 case COMMAND_COMPLETE: 2253 /* Accept message by clearing ACK */ 2254 sink = 1; 2255 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2256 hostdata->connected = NULL; 2257 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2258 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2259 2260 /* 2261 * I'm not sure what the correct thing to do here is : 2262 * 2263 * If the command that just executed is NOT a request 2264 * sense, the obvious thing to do is to set the result 2265 * code to the values of the stored parameters. 2266 * 2267 * If it was a REQUEST SENSE command, we need some way 2268 * to differentiate between the failure code of the original 2269 * and the failure code of the REQUEST sense - the obvious 2270 * case is success, where we fall through and leave the result 2271 * code unchanged. 2272 * 2273 * The non-obvious place is where the REQUEST SENSE failed 2274 */ 2275 2276 if (cmd->cmnd[0] != REQUEST_SENSE) 2277 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2278 else if (status_byte(cmd->SCp.Status) != GOOD) 2279 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2280 2281 #ifdef AUTOSENSE 2282 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2283 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); 2284 cmd->cmnd[0] = REQUEST_SENSE; 2285 cmd->cmnd[1] &= 0xe0; 2286 cmd->cmnd[2] = 0; 2287 cmd->cmnd[3] = 0; 2288 cmd->cmnd[4] = sizeof(cmd->sense_buffer); 2289 cmd->cmnd[5] = 0; 2290 2291 cmd->SCp.buffer = NULL; 2292 cmd->SCp.buffers_residual = 0; 2293 cmd->SCp.ptr = (char *) cmd->sense_buffer; 2294 cmd->SCp.this_residual = sizeof(cmd->sense_buffer); 2295 2296 LIST(cmd, hostdata->issue_queue); 2297 cmd->host_scribble = (unsigned char *) 2298 hostdata->issue_queue; 2299 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2300 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); 2301 } else 2302 #endif /* def AUTOSENSE */ 2303 { 2304 collect_stats(hostdata, cmd); 2305 cmd->scsi_done(cmd); 2306 } 2307 2308 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2309 /* 2310 * Restore phase bits to 0 so an interrupted selection, 2311 * arbitration can resume. 2312 */ 2313 NCR5380_write(TARGET_COMMAND_REG, 0); 2314 2315 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2316 barrier(); 2317 return; 2318 case MESSAGE_REJECT: 2319 /* Accept message by clearing ACK */ 2320 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2321 switch (hostdata->last_message) { 2322 case HEAD_OF_QUEUE_TAG: 2323 case ORDERED_QUEUE_TAG: 2324 case SIMPLE_QUEUE_TAG: 2325 cmd->device->simple_tags = 0; 2326 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2327 break; 2328 default: 2329 break; 2330 } 2331 case DISCONNECT:{ 2332 /* Accept message by clearing ACK */ 2333 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2334 cmd->device->disconnect = 1; 2335 LIST(cmd, hostdata->disconnected_queue); 2336 cmd->host_scribble = (unsigned char *) 2337 hostdata->disconnected_queue; 2338 hostdata->connected = NULL; 2339 hostdata->disconnected_queue = cmd; 2340 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2341 /* 2342 * Restore phase bits to 0 so an interrupted selection, 2343 * arbitration can resume. 2344 */ 2345 NCR5380_write(TARGET_COMMAND_REG, 0); 2346 2347 /* Enable reselect interrupts */ 2348 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2349 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2350 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2351 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2352 barrier(); 2353 return; 2354 } 2355 /* 2356 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2357 * operation, in violation of the SCSI spec so we can safely 2358 * ignore SAVE/RESTORE pointers calls. 2359 * 2360 * Unfortunately, some disks violate the SCSI spec and 2361 * don't issue the required SAVE_POINTERS message before 2362 * disconnecting, and we have to break spec to remain 2363 * compatible. 2364 */ 2365 case SAVE_POINTERS: 2366 case RESTORE_POINTERS: 2367 /* Accept message by clearing ACK */ 2368 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2369 break; 2370 case EXTENDED_MESSAGE: 2371 /* 2372 * Extended messages are sent in the following format : 2373 * Byte 2374 * 0 EXTENDED_MESSAGE == 1 2375 * 1 length (includes one byte for code, doesn't 2376 * include first two bytes) 2377 * 2 code 2378 * 3..length+1 arguments 2379 * 2380 * Start the extended message buffer with the EXTENDED_MESSAGE 2381 * byte, since spi_print_msg() wants the whole thing. 2382 */ 2383 extended_msg[0] = EXTENDED_MESSAGE; 2384 /* Accept first byte by clearing ACK */ 2385 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2386 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); 2387 2388 len = 2; 2389 data = extended_msg + 1; 2390 phase = PHASE_MSGIN; 2391 NCR5380_transfer_pio(instance, &phase, &len, &data); 2392 2393 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); 2394 2395 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2396 /* Accept third byte by clearing ACK */ 2397 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2398 len = extended_msg[1] - 1; 2399 data = extended_msg + 3; 2400 phase = PHASE_MSGIN; 2401 2402 NCR5380_transfer_pio(instance, &phase, &len, &data); 2403 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); 2404 2405 switch (extended_msg[2]) { 2406 case EXTENDED_SDTR: 2407 case EXTENDED_WDTR: 2408 case EXTENDED_MODIFY_DATA_POINTER: 2409 case EXTENDED_EXTENDED_IDENTIFY: 2410 tmp = 0; 2411 } 2412 } else if (len) { 2413 printk("scsi%d: error receiving extended message\n", instance->host_no); 2414 tmp = 0; 2415 } else { 2416 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2417 tmp = 0; 2418 } 2419 /* Fall through to reject message */ 2420 2421 /* 2422 * If we get something weird that we aren't expecting, 2423 * reject it. 2424 */ 2425 default: 2426 if (!tmp) { 2427 printk("scsi%d: rejecting message ", instance->host_no); 2428 spi_print_msg(extended_msg); 2429 printk("\n"); 2430 } else if (tmp != EXTENDED_MESSAGE) 2431 scmd_printk(KERN_INFO, cmd, 2432 "rejecting unknown message %02x\n",tmp); 2433 else 2434 scmd_printk(KERN_INFO, cmd, 2435 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 2436 2437 msgout = MESSAGE_REJECT; 2438 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2439 break; 2440 } /* switch (tmp) */ 2441 break; 2442 case PHASE_MSGOUT: 2443 len = 1; 2444 data = &msgout; 2445 hostdata->last_message = msgout; 2446 NCR5380_transfer_pio(instance, &phase, &len, &data); 2447 if (msgout == ABORT) { 2448 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2449 hostdata->connected = NULL; 2450 cmd->result = DID_ERROR << 16; 2451 collect_stats(hostdata, cmd); 2452 cmd->scsi_done(cmd); 2453 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2454 return; 2455 } 2456 msgout = NOP; 2457 break; 2458 case PHASE_CMDOUT: 2459 len = cmd->cmd_len; 2460 data = cmd->cmnd; 2461 /* 2462 * XXX for performance reasons, on machines with a 2463 * PSEUDO-DMA architecture we should probably 2464 * use the dma transfer function. 2465 */ 2466 NCR5380_transfer_pio(instance, &phase, &len, &data); 2467 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2468 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2469 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2470 return; 2471 } 2472 break; 2473 case PHASE_STATIN: 2474 len = 1; 2475 data = &tmp; 2476 NCR5380_transfer_pio(instance, &phase, &len, &data); 2477 cmd->SCp.Status = tmp; 2478 break; 2479 default: 2480 printk("scsi%d : unknown phase\n", instance->host_no); 2481 NCR5380_dprint(NDEBUG_ALL, instance); 2482 } /* switch(phase) */ 2483 } /* if (tmp * SR_REQ) */ 2484 else { 2485 /* RvC: go to sleep if polling time expired 2486 */ 2487 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2488 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2489 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2490 return; 2491 } 2492 } 2493 } /* while (1) */ 2494 } 2495 2496 /* 2497 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2498 * 2499 * Purpose : does reselection, initializing the instance->connected 2500 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2501 * nexus has been reestablished, 2502 * 2503 * Inputs : instance - this instance of the NCR5380. 2504 * 2505 * Locks: io_request_lock held by caller if IRQ driven 2506 */ 2507 2508 static void NCR5380_reselect(struct Scsi_Host *instance) { 2509 NCR5380_local_declare(); 2510 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2511 instance->hostdata; 2512 unsigned char target_mask; 2513 unsigned char lun, phase; 2514 int len; 2515 unsigned char msg[3]; 2516 unsigned char *data; 2517 Scsi_Cmnd *tmp = NULL, *prev; 2518 int abort = 0; 2519 NCR5380_setup(instance); 2520 2521 /* 2522 * Disable arbitration, etc. since the host adapter obviously 2523 * lost, and tell an interrupted NCR5380_select() to restart. 2524 */ 2525 2526 NCR5380_write(MODE_REG, MR_BASE); 2527 hostdata->restart_select = 1; 2528 2529 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2530 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); 2531 2532 /* 2533 * At this point, we have detected that our SCSI ID is on the bus, 2534 * SEL is true and BSY was false for at least one bus settle delay 2535 * (400 ns). 2536 * 2537 * We must assert BSY ourselves, until the target drops the SEL 2538 * signal. 2539 */ 2540 2541 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2542 2543 /* FIXME: timeout too long, must fail to workqueue */ 2544 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2545 abort = 1; 2546 2547 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2548 2549 /* 2550 * Wait for target to go into MSGIN. 2551 * FIXME: timeout needed and fail to work queeu 2552 */ 2553 2554 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2555 abort = 1; 2556 2557 len = 1; 2558 data = msg; 2559 phase = PHASE_MSGIN; 2560 NCR5380_transfer_pio(instance, &phase, &len, &data); 2561 2562 if (!(msg[0] & 0x80)) { 2563 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2564 spi_print_msg(msg); 2565 abort = 1; 2566 } else { 2567 /* Accept message by clearing ACK */ 2568 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2569 lun = (msg[0] & 0x07); 2570 2571 /* 2572 * We need to add code for SCSI-II to track which devices have 2573 * I_T_L_Q nexuses established, and which have simple I_T_L 2574 * nexuses so we can chose to do additional data transfer. 2575 */ 2576 2577 /* 2578 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2579 * just reestablished, and remove it from the disconnected queue. 2580 */ 2581 2582 2583 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2584 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2585 ) { 2586 if (prev) { 2587 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2588 prev->host_scribble = tmp->host_scribble; 2589 } else { 2590 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2591 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2592 } 2593 tmp->host_scribble = NULL; 2594 break; 2595 } 2596 if (!tmp) { 2597 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2598 /* 2599 * Since we have an established nexus that we can't do anything with, 2600 * we must abort it. 2601 */ 2602 abort = 1; 2603 } 2604 } 2605 2606 if (abort) { 2607 do_abort(instance); 2608 } else { 2609 hostdata->connected = tmp; 2610 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); 2611 } 2612 } 2613 2614 /* 2615 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2616 * 2617 * Purpose : called by interrupt handler when DMA finishes or a phase 2618 * mismatch occurs (which would finish the DMA transfer). 2619 * 2620 * Inputs : instance - this instance of the NCR5380. 2621 * 2622 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2623 * nexus has been reestablished, on failure NULL is returned. 2624 */ 2625 2626 #ifdef REAL_DMA 2627 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2628 NCR5380_local_declare(); 2629 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata); 2630 int transferred; 2631 NCR5380_setup(instance); 2632 2633 /* 2634 * XXX this might not be right. 2635 * 2636 * Wait for final byte to transfer, ie wait for ACK to go false. 2637 * 2638 * We should use the Last Byte Sent bit, unfortunately this is 2639 * not available on the 5380/5381 (only the various CMOS chips) 2640 * 2641 * FIXME: timeout, and need to handle long timeout/irq case 2642 */ 2643 2644 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2645 2646 NCR5380_write(MODE_REG, MR_BASE); 2647 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2648 2649 /* 2650 * The only places we should see a phase mismatch and have to send 2651 * data from the same set of pointers will be the data transfer 2652 * phases. So, residual, requested length are only important here. 2653 */ 2654 2655 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2656 transferred = instance->dmalen - NCR5380_dma_residual(); 2657 hostdata->connected->SCp.this_residual -= transferred; 2658 hostdata->connected->SCp.ptr += transferred; 2659 } 2660 } 2661 #endif /* def REAL_DMA */ 2662 2663 /* 2664 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2665 * 2666 * Purpose : abort a command 2667 * 2668 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2669 * host byte of the result field to, if zero DID_ABORTED is 2670 * used. 2671 * 2672 * Returns : 0 - success, -1 on failure. 2673 * 2674 * XXX - there is no way to abort the command that is currently 2675 * connected, you have to wait for it to complete. If this is 2676 * a problem, we could implement longjmp() / setjmp(), setjmp() 2677 * called where the loop started in NCR5380_main(). 2678 * 2679 * Locks: host lock taken by caller 2680 */ 2681 2682 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2683 NCR5380_local_declare(); 2684 struct Scsi_Host *instance = cmd->device->host; 2685 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2686 Scsi_Cmnd *tmp, **prev; 2687 2688 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2689 scsi_print_command(cmd); 2690 2691 NCR5380_print_status(instance); 2692 2693 NCR5380_setup(instance); 2694 2695 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); 2696 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); 2697 2698 #if 0 2699 /* 2700 * Case 1 : If the command is the currently executing command, 2701 * we'll set the aborted flag and return control so that 2702 * information transfer routine can exit cleanly. 2703 */ 2704 2705 if (hostdata->connected == cmd) { 2706 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); 2707 hostdata->aborted = 1; 2708 /* 2709 * We should perform BSY checking, and make sure we haven't slipped 2710 * into BUS FREE. 2711 */ 2712 2713 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2714 /* 2715 * Since we can't change phases until we've completed the current 2716 * handshake, we have to source or sink a byte of data if the current 2717 * phase is not MSGOUT. 2718 */ 2719 2720 /* 2721 * Return control to the executing NCR drive so we can clear the 2722 * aborted flag and get back into our main loop. 2723 */ 2724 2725 return 0; 2726 } 2727 #endif 2728 2729 /* 2730 * Case 2 : If the command hasn't been issued yet, we simply remove it 2731 * from the issue queue. 2732 */ 2733 2734 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); 2735 for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) 2736 if (cmd == tmp) { 2737 REMOVE(5, *prev, tmp, tmp->host_scribble); 2738 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2739 tmp->host_scribble = NULL; 2740 tmp->result = DID_ABORT << 16; 2741 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); 2742 tmp->done(tmp); 2743 return SUCCESS; 2744 } 2745 #if (NDEBUG & NDEBUG_ABORT) 2746 /* KLL */ 2747 else if (prev == tmp) 2748 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2749 #endif 2750 2751 /* 2752 * Case 3 : If any commands are connected, we're going to fail the abort 2753 * and let the high level SCSI driver retry at a later time or 2754 * issue a reset. 2755 * 2756 * Timeouts, and therefore aborted commands, will be highly unlikely 2757 * and handling them cleanly in this situation would make the common 2758 * case of noresets less efficient, and would pollute our code. So, 2759 * we fail. 2760 */ 2761 2762 if (hostdata->connected) { 2763 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); 2764 return FAILED; 2765 } 2766 /* 2767 * Case 4: If the command is currently disconnected from the bus, and 2768 * there are no connected commands, we reconnect the I_T_L or 2769 * I_T_L_Q nexus associated with it, go into message out, and send 2770 * an abort message. 2771 * 2772 * This case is especially ugly. In order to reestablish the nexus, we 2773 * need to call NCR5380_select(). The easiest way to implement this 2774 * function was to abort if the bus was busy, and let the interrupt 2775 * handler triggered on the SEL for reselect take care of lost arbitrations 2776 * where necessary, meaning interrupts need to be enabled. 2777 * 2778 * When interrupts are enabled, the queues may change - so we 2779 * can't remove it from the disconnected queue before selecting it 2780 * because that could cause a failure in hashing the nexus if that 2781 * device reselected. 2782 * 2783 * Since the queues may change, we can't use the pointers from when we 2784 * first locate it. 2785 * 2786 * So, we must first locate the command, and if NCR5380_select() 2787 * succeeds, then issue the abort, relocate the command and remove 2788 * it from the disconnected queue. 2789 */ 2790 2791 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2792 if (cmd == tmp) { 2793 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); 2794 2795 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2796 return FAILED; 2797 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); 2798 2799 do_abort(instance); 2800 2801 for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) 2802 if (cmd == tmp) { 2803 REMOVE(5, *prev, tmp, tmp->host_scribble); 2804 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2805 tmp->host_scribble = NULL; 2806 tmp->result = DID_ABORT << 16; 2807 tmp->done(tmp); 2808 return SUCCESS; 2809 } 2810 } 2811 /* 2812 * Case 5 : If we reached this point, the command was not found in any of 2813 * the queues. 2814 * 2815 * We probably reached this point because of an unlikely race condition 2816 * between the command completing successfully and the abortion code, 2817 * so we won't panic, but we will notify the user in case something really 2818 * broke. 2819 */ 2820 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2821 " before abortion\n", instance->host_no); 2822 return FAILED; 2823 } 2824 2825 2826 /* 2827 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2828 * 2829 * Purpose : reset the SCSI bus. 2830 * 2831 * Returns : SUCCESS 2832 * 2833 * Locks: host lock taken by caller 2834 */ 2835 2836 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2837 { 2838 struct Scsi_Host *instance = cmd->device->host; 2839 2840 NCR5380_local_declare(); 2841 NCR5380_setup(instance); 2842 NCR5380_print_status(instance); 2843 2844 spin_lock_irq(instance->host_lock); 2845 do_reset(instance); 2846 spin_unlock_irq(instance->host_lock); 2847 2848 return SUCCESS; 2849 } 2850